The megathrust boundary between the plates results in both the 4,000-km-long Aleutian Trench and in the arc of active volcanoes that lie subparallel to the trench. The 1964 M9.2 Great Alaska Earthquake, which is still the second largest earthquake ever recorded worldwide, began under Prince William Sound. Four out of five earthquakes in the United States occur in Alaska. The horizontal sliding of the Pacific Plate relative to the North American Plate, causes earthquakes along the San … The 1964 Great Alaska Earthquake occurred on Good Friday, March 27th. The March 27, 1964, earthquake was accomp anied by crustal deformation-including warping, horizontal distortion, and faulting-over probably more than 110,000 square miles of land and sea bottom in south-central Alaska. After the 1964 megathrust earthquake, three-quarters of the Aleutian subduction zone ruptured in a span of eight years. Alaskan tectonics are dominated by Pacific-North American plate interaction. Two of these moving plates meet in western California; the boundary between them is a zone of faults, the principal one being the San Andreas fault. Wow a 9.2 Magnitude earthquake - now that is big! The U.S. Geological Survey reports that: The earthquake caused rivers, lakes, and other waterways to slosh … Across south-central Alaska, ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 131 deaths.. The 1964 earthquake in Anchorage, Alaska occurred as a result of an oceanic plate sinking under a continental or land plate. The pink highlighted region shows the part of the megathrust fault (plate boundary) that slipped in 1964 during the Great Alaskan Earthquake. Perspective view of the Pacific Plate being subducted beneath the North American plate at the Alaska-Aleutian Subduction zone. The Great Alaska Earthquake, also known as the Good Friday quake, left behind a graphic tutorial in the power of plate tectonics, which was then still mostly a theory. The 1964 Alaskan earthquake, also known as the Great Alaskan earthquake and Good Friday earthquake, occurred at 5:36 PM AKST on Good Friday, March 27. Two types of tsunami were produced as a result of this massive quake. (2) Intermediate depth seismicity (below 20 miles) occurs in the so-called Benioff Zone, where the subducting Pacific Plate descends towards the mantle beneath the North American Plate. The large magnitude event (9.2) was the largest earthquake recorded in the U.S. during this century, and occurred on Good Friday in 1964. White arrows show relative plate … Note the location of the plate boundary, which marks the Aleutian … On Good Friday, March 27, 1964, at 5:36 p.m. local time, the earth began to shake in the subduction zone in the Prince William Sound in Alaska. 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